JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://documentcloud.github.com/underscore/underscore.js"></script>

JavaScript

var a = {
    name : "Foo",
    amount: 55,
    reported : false,
    date : "10/01/2001"
};

var map = {
    name : "id",
    amount : "total",
    reported : "updated",
    date : "issued"
};

b = _.reduce(a, function(result, value, key) {
    key = map[key] || key;
    result[key] = value;
    return result;
}, {});

console.log(b);